Astro vulnerable to reflected XSS via the server islands feature

Description

After some research it appears that it is possible to obtain a reflected XSS when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s).

Recommendation

Update the astro package to the latest compatible version. Followings are version details:

• Affected version(s): <= 5.15.6
• Patched version(s): 5.15.8

References

• GHSA-wrwg-2hg8-v723
• CVE-2025-64764
• CWE-79
• CWE-80
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Astro development server error page is vulnerable to reflected Cross-site Scripting - CVE-2025-64745
• Quill is vulnerable to XSS via HTML export feature - CVE-2025-15056
• Parse Server vulnerable to stored cross-site scripting (XSS) via SVG file upload - CVE-2026-30948
• Nuxt OG Image is vulnerable to reflected XSS via query parameter injection into HTML attributes - CVE-2026-34405

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Tags:

npm

astro